What is the next sentence of Chun Lei? What does this poem mean?

1. Spring thunder makes everything grow.

2. Before the thunder stung, the spring thunder rang on July 49, and the sun was not seen for 49 days.

"Spring thunder, everything grows" means: when spring thunder comes, spring comes, everything recovers and a new year comes. This proverb is about the solar terms that scare people.

I didn't see the sky on July 49 before the thunder. This sentence is the golden rule in the eyes of experienced old farmers. This proverb shows that once it thunders before it thunders, it will rain continuously. According to this statement, from the first spring thunder in the Year of the Loong, rainy weather will last until Qingming.